1320121011 has 24 divisors (see below), whose sum is σ = 1940744512. Its totient is φ = 797583600.

The previous prime is 1320121003. The next prime is 1320121013. The reversal of 1320121011 is 1101210231.

It is not a de Polignac number, because 1320121011 - 2³ = 1320121003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1320121013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 114660 + ... + 125646.

Almost surely, 2^1320121011 is an apocalyptic number.

1320121011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1320121011 is a deficient number, since it is larger than the sum of its proper divisors (620623501).

1320121011 is a wasteful number, since it uses less digits than its factorization.

1320121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11343 (or 11332 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 1320121011 is about 36333.4695700810. The cubic root of 1320121011 is about 1096.9948307716.

Adding to 1320121011 its reverse (1101210231), we get a palindrome (2421331242).

The spelling of 1320121011 in words is "one billion, three hundred twenty million, one hundred twenty-one thousand, eleven".